The OEM coolant I buy here in the UAE is part number A 000 989 08 25 to spec. 325.2 and is BLUE. Both my cars run on a 55%/45% mix and I suffer no overheating problems or corrosion on either of them. We cannot get Water Wetter here and I am not sure I would really like to try it as the car temperatures are O.K. for me, although the 500E gets a little warm after some ' spirited ' driving. My personal choice is to change the collant every year and I pre-mix about 5 gallons of coolant and have it in the container as a top off for the rest of the time. I think it is vital to stay on top of the cooling system components all the time as these engines like to run hot all the time.

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1993 190E 2.0L (Euro.) sold
1991. 500 SEL (Euro.)
1991. 300 CE (Euro.) sold
1993. 500 E (U.S. spec.)